Upgrading from 3G to iphone 4 - do I swap the SIM?

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@gatorbrit wrote:

I have two phones on my plan.  My phone and my wifes.  My phone is eligible for an upgrade to a iphone 4, but my wife's phone isn't.   

I wanted to check whether I could do the following.

1. Order a new upgrade phone for my phone.

2. Then use my wifes sim card in the new phone - in effect let her have the upgrade.

 

What are the steps to do this?  Is it just a matter of getting the new phone and putting her 3G sim card in it and then syncing with itunes?  Or is there more to it?

 

Also are the 3g sim cards the same as the 4 sim cards?

 

Thanks

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Very doable.  Order the upgrade for you.  When the iPHone 4 arives, call att and tell them you will be activating the new iPhone on your wifes account.  They will swap things around on their system.  The SIMS are not the same size but this is not a problem.  Once ATT does their thing, you will activate the iPhone on your wifes account and the old SIM will be deactivated.

Thanks for the super quick reply!!

Just as a point of clarification, even though AT&T will only allow me to upgrade one phone right now, they don't really care which one it is then?

THanks - that's brilliant.